Purely as a matter of factual data and interest, a rough list of average vertical scales that a variety of wideband drive unit manufacturers tend to use. There is some variation over time, so this should not be read as (nor intended to be) definitive:
In no particular order:
Fostex: 80dB
HiVi: 80dB
Tymphany (or whatever they are calling themselves on this day in history): Variable but typically 50dB
Aurasound: 70dB
Fountek: 100dB
MA: 100dB
SB: 60dB
Sica: 60dB
Audio Nirvana 100dB - 120dB
Lowther: 60dB
Beyma: 100dB
Supravox: about 80dB
PHY: (speaking under correction) about 100dB
Sonido: 50dB
Lii Audio: 100dB
Goldwood: 70dB
Visaton: 60dB
Omnes: depends who built it for them, roughly 60dB - 100dB
Lyeco: 70dB
Hartley: Nothing
Tang Band: 100dB
Dayton: 60dB
Celestion: 65dB
Gradient: 50dB
AER: 120dB
Eminence: 70dB
Cube: 120dB
Fertin: Nothing
Voxativ: typically few published FR plots although you can find some from the Ampeggio horn system
Feastrex: Nothing
By and large, most of the companies that use 50dB vertical scaling tend to be those who produce more conventional limited band drive units as well, for whom wideband are merely a side-issue or addition, and generally they standardise all their graphs to that. Not all, but a relatively common trend. Seas, Scan, Tymphany / Peerless / Vifa / whatever it is today are good examples of that. Wideband drive units rarely look particularly attractive on a graph of that size unless laterally stretched, which takes up space & is no more representative than a less laterally compressed graph at a larger vertical scale, so manufacturers tend to use something larger. Many who used LMS tended to let it select the default, which is why you'll also often see a rather oddly scaled logarithmic impedance plot.
